Signals were recorded at a site off the New Zealand coast during the 1994
ATOC Acoustic Engineering Test (AET) using a single hydrophone at the SOFAR axis
suspended from a drifting sonobuoy. The receptions recorded were limited to a
2-day period due to weather and logistic constraints, but those analyzed showed
considerable variability in structure from transmission to transmission. This
path is particularly interesting because of its length (10 Mm) and its
transequatorial nature. A moored, autonomous system was deployed in early 1996
off the New Zealand coast to acquire data over several months to investigate
signal variability further. The source was on the Pioneer Seamount, and the
single hydrophone moored at the SOFAR axis channel depth. These data and their
analysis will be presented and discussed.